@media (device-height:480px) and (-webkit-min-device-pixel-ratio:2){/* 兼容iphone4/4s */


}

@media (device-height:568px) and (-webkit-min-device-pixel-ratio:2){/* 兼容iphone5 */

    .class{}

}


@media (device-height:667px) and (-webkit-min-device-pixel-ratio:2){/* 兼容iphone6 */

    .class{}

}

@media (device-height:736px) and (-webkit-min-device-pixel-ratio:3){/* 兼容iphone6 Plus */
    .formi_contianer{
    		width: 350px;
    		height: 250px;
    		position: absolute;
    		top: 50%;
    		left: 50%;
    		margin-top: -105px;
    		margin-left: -225px;
    		padding: 25px;
    		border-radius: 5px;
    		text-align: center;
    		background-color: #fff;
    }
}